Ferroli Divatop ST F 24 Troubleshooting guide

(cod. 3540E821 — 11/2008 (Rev. 00)
DIVAtop F 24
INSTRUCTIONS FOR USE, INSTALLATION AND MAINTENANCE
INSTRUCTIONS D'UTILISATION, D'INSTALLATION ET D'ENTRETIEN
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DIVAtop F 24
2EN
B
Declaration of conformity
Manufacturer: FERROLI S.p.A.
Address: Via Ritonda 78/a 37047 San Bonifacio VR Italy
declares that this unit complies with the following EU directives:
• Gas Appliance Directive 90/396
• Efficiency Directive 92/42
• Low Voltage Directive 73/23 (amended by 93/68)
• Electromagnetic Compatibility Directive 89/336 (amended by 93/68)
President and Legal Representative
Cav. del Lavoro
Dante Ferroli
BThis symbol indicates "Caution" and is placed next to all safety warnings. Strictly follow
these instructions in order to avoid danger and damage to persons, animals and things.
AThis symbols calls attention to a note or important notice.
cod. 3540E821 - 11/2008 (Rev. 00)
• Carefully read the warnings in this instruction book-
let since they provide important information on safe
installation, use and maintenance.
• This instruction booklet is an integral part of the
product and must be carefully kept by the user for fu-
ture reference.
• If the unit is sold or transferred to another owner or if
it is to be moved, always make sure that the booklet
accompanies the boiler so that it can be consulted
by the new owner and/or installer.
• Installation and maintenance must be carried out by
professionally qualified personnel, according to cur-
rent regulations and the manufacturer's instructions.
• Incorrect installation or poor maintenance can cause
damage or physical injury. The manufacturer de-
clines any responsibility for damage caused by er-
rors in installation and use or by failure to follow the
manufacturer's instructions.
• Before carrying out any cleaning or maintenance op-
eration, disconnect the unit from the electrical power
supply using the switch and/or the special cut-off de-
vices.
• In case the unit breaks down and/or functions poorly,
deactivate it, do not make any attempt to repair it or
directly intervene. Contact professionally qualified
personnel. Any repair/replacement of products must
only be carried out by qualified professional person-
nel using exclusively genuine parts. Failure to com-
ply with the above could affect the safety of the unit.
• Periodical maintenance carried out by qualified per-
sonnel is essential for guaranteeing good operation
of the unit.
• This unit must only be used for the purpose for which
it was designed. Any other use is considered im-
proper and therefore hazardous.
• After removing the packing, check the integrity of the
contents. Packing materials must not be left within
the reach of children as they are potentially hazard-
ous.
• In case of doubt do not use the unit, and contact the
supplier.
• The images shown in this manual are a simplified
representation of the product. In this representation
there may be slight, unimportant differences with the
supplied product.

DIVAtop F 24
3
(cod. 3540E821 - 11/2008 (Rev. 00)
1 Operating instructions ............................................................................................................ 4
1.1 Introduction............................................................................................................................................. 4
1.2 Control panel ..........................................................................................................................................4
1.3 Turning on and off .................................................................................................................................. 6
1.4 Adjustments............................................................................................................................................ 7
2 Installation .............................................................................................................................. 12
2.1 General Instructions ............................................................................................................................. 12
2.2 Place of installation ..............................................................................................................................12
2.3 Plumbing connections .......................................................................................................................... 12
2.4 Gas connection ....................................................................................................................................13
2.5 Electrical connections........................................................................................................................... 13
2.6 Air/fume ducts ......................................................................................................................................14
3 Service and maintenance...................................................................................................... 19
3.1 Adjustments.......................................................................................................................................... 19
3.2 System start-up ....................................................................................................................................21
3.3 Maintenance......................................................................................................................................... 22
3.4 Troubleshooting.................................................................................................................................... 24
4 Technical data and characteristics ...................................................................................... 26
4.1 Dimensions and connections ............................................................................................................... 26
4.2 General view and main components ....................................................................................................27
4.3 Plumbing circuit ....................................................................................................................................28
4.4 Technical data table ............................................................................................................................. 29
4.5 Diagrams .............................................................................................................................................. 30
4.6 Wiring diagram ..................................................................................................................................... 31

DIVAtop F 24
4EN
cod. 3540E821 - 11/2008 (Rev. 00)
1. Operating instructions
1.1 Introduction
Dear Customer
Thank you for choosing a wall-mounted boiler featuring FERROLIadvanced design, cutting-edge technology, high re-
liability and quality construction. Please read this manual carefully since it provides important information on safe in-
stallation, use and maintenance.
DIVAtop F 24 is a high-efficiency heat generator for heating and domestic hot water production, running on natural gas
or LPG, equipped with an open-flue burner with electronic ignition, sealed chamber, modulating fan and microprocessor
control system,
1.2 Control panel
fig. 1 - Control panel
Legend
1 = Button to decrease the hot tap water tempera-
ture setting
2 = Button to increase the hot tap water temperature
setting
3 = Button to decrease the heating system tempera-
ture setting
4 = Button to increase the heating system tempera-
ture setting
5 = Display
6 = Summer / Winter mode selection button
7 = Economy / Comfort mode selection button
8 = Reset Button
9 = Unit on / off button
10 = "Sliding Temperature" menu button
11 = Indicator for reaching set hot tap water tempera-
ture
12 = Hot tap water symbol
13 = Tap water operation indicator
14 = Setting / temperature of hot tap water outlet
15 = Eco (Economy) or Comfort mode indicator
16 = Outside sensor temperature (with optional out-
side sensor)
17 = Appears upon connecting the Outside Sensor or
the Remote Timer Control (optional items)
18 = Room temperature (with optional Remote Timer
Control)
19 = Indicator for burner on and current power
20 = Antifreeze operation indicator
21 = Heating system pressure indicator
22 = Fault indicator
23 = Setting / temperature of heating delivery
24 = Heating symbol
25 = Heating operation indicator
26 = Indicator for reaching set heating delivery tem-
perature
27 = Summer mode indicator
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43
12 14
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15 16
17182021222325
24
26
27
19

DIVAtop F 24
5EN cod. 3540E821 - 11/2008 (Rev. 00)
Indicator during operation
Heating
The call for heating (generated by the Room Thermostat or Remote Timer Control) is indicated by the hot air flashing
above the radiator (part 24 and 25 - fig. 1).
The graduated heating marks (part 26 - fig. 1) light up as the heating sensor temperature reaches the setting.
fig. 2
Hot water
The call for hot water (generated by drawing off hot tap water) is indicated by the hot water flashing under the tap (part
12 and 13 - fig. 1).
The graduated hot tap water marks (part 11 - fig. 1) light up as the tap water sensor temperature reaches the setting.
fig. 3
Comfort
The call for Comfort (restoring the internal temperature of the boiler) is indicated by the Comfort symbol flashing (part
15 and 13 - fig. 1).
fig. 4
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DIVAtop F 24
6EN
cod. 3540E821 - 11/2008 (Rev. 00)
1.3 Turning on and off
Boiler not electrically powered
fig. 5 - Boiler not powered
BThe antifreeze system does not work when the power and/or gas to the unit are turned off. To avoid damage
caused by freezing during long idle periods in winter, it is advisable to drain all the water from the boiler, DHW
circuit and system; or drain just the DHW circuit and add a suitable antifreeze to the heating system, complying
with that prescribed in sec. 2.3.
Boiler ignition
Supply the unit with electricity.
fig. 6 - Boiler ignition
• For the following 120 seconds the display will show FH that identifies the air venting cycle for the heating system.
• During the first 5 seconds the display will show the software release of the card too.
• Open the gas valve ahead of the boiler.
• When FH vanishes, the boiler is ready to work automatically whenever hot tap water is drawn or the room thermostat
requests heating.
Turning the boiler off
Press the button (detail 9 - fig. 1) for 1 second.
fig. 7 - Turning the boiler off
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DIVAtop F 24
7EN cod. 3540E821 - 11/2008 (Rev. 00)
When the boiler is turned off, the electronic board is still powered.
Domestic hot water and heating operation are disabled. The antifreeze system remains activated.
To re-light the boiler, press the button (detail 9 fig. 1) again for 1 second.
fig. 8
The boiler will be immediately ready to operate whenever domestic hot water is drawn or in case of a room thermostat
demand.
1.4 Adjustments
Summer/Winter Switchover
Press the button (part 6 - fig. 1) for 1 second.
fig. 9
The display will activate the Summer symbol (part 27 - fig. 1): the boiler will deliver tap water only. The antifreeze system
stays on.
To turn off Summer mode, press button (part 6 - fig. 1) again for 1 second.
Heating temperature setting
Use the heating buttons (part 3 and 4 - fig. 1) to change the temperature from a minimum of 30 °C to a max-
imum of 85 °C; it is anyhow advisable not to operate the boiler below 45 °C.
fig. 10
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DIVAtop F 24
8EN
cod. 3540E821 - 11/2008 (Rev. 00)
Domestic hot water temperature adjustment
Operate the DHW buttons (details 1 and 2 - fig. 1) to vary the temperature from a minimum of 40°C to a max-
imum of 55°C.
fig. 11
Room temperature adjustment (with optional room thermostat)
Using the room thermostat, set the temperature desired in the rooms. If the room thermostat is not installed the boiler
will keep the heating system at its setpoint temperature.
Room temperature adjustment (with optional remote timer control)
Using the remote timer control, set the temperature desired in the rooms. The boiler unit will set the system water ac-
cording to the required room temperature. For information on the remote timer control, please refer to its user's manual.
ECO/COMFORT selection
The unit is equipped with a function that ensures a high hot-water delivery speed and excellent user comfort. When the
device is working (COMFORT mode), the water in the boiler is kept at temperature, which means that hot water is avail-
able at the boiler outlet as soon as a tap is opened, with no waiting.
The user can turn the device off (ECO mode) by pressing the button (part 7 - fig. 1). To turn on COMFORT mode,
press the button again (part 7 - fig. 1).
Sliding temperature
When the optional external probe is installed the control panel display (detail 5 - fig. 1) shows the actual outside tem-
perature read by the probe. The boiler control system operates with "Sliding Temperature”. In this mode, the tempera-
ture of the heating system is controlled according to the outside weather conditions, in order to ensure high comfort and
energy saving throughout the year. In particular, as the outside temperature increases the system delivery temperature
decreases according to a specific "compensation curve”.
With Sliding Temperature adjustment, the temperature set with the heating buttons (details 3 and 4 - fig. 1)
becomes the maximum system delivery temperature. It is advisable to set the maximum value to allow system adjust-
ment throughout its useful working range.
The boiler must be adjusted at the time of installation by qualified personnel. Adjustments can in any case be made by
the user to improve comfort.
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DIVAtop F 24
9EN cod. 3540E821 - 11/2008 (Rev. 00)
Compensation curve and curve offset
Press the button (detail 10 - fig. 1) once to display the actual compensation curve (fig. 12), which can be modified
with the DHW buttons (details 1 and 2 - fig. 1).
Adjust the required curve from 1 to 10 according to the characteristic (fig. 14).
By setting the curve to 0, sliding temperature adjustment is disabled.
fig. 12 - Compensation curve
Press the heating buttons (details 3 and 4 - fig. 1) to access parallel curve offset (fig. 15), modifiable with the
DHW buttons (details 1 and 2 - fig. 1).
fig. 13 - Parallel curve shift
Press the button (detail 10 - fig. 1) again to exit parallel curve adjustment mode.

DIVAtop F 24
10 EN
cod. 3540E821 - 11/2008 (Rev. 00)
If the room temperature is lower lower than the required value, it is advisable to set a higher order curve and vice versa.
Proceed by increasing or decreasing in steps of one and check the result in the room.
fig. 14 - Compensation curves
fig. 15 - Example of parallel compensation curve shift
Adjustments from remote timer control
AIf the Remote Timer Control (optional) is connected to the boiler, the above adjustments are managed accord-
ing to that given in table 1. Also, the control panel display (detail 5 - fig. 1) shows the actual room temperature
read by the Remote Timer Control.
Table. 1
Heating temperature adjustment Adjustment can be made from the Remote Timer Control menu and the boiler
control panel.
Domestic hot water temperature adjustment Adjustment can be made from the Remote Timer Control menu and the boiler
control panel.
Summer/Winter switchover Summer mode has priority over a possible Remote Timer Control heating
demand.
Eco/Comfort selection
On disabling DHW from the Remote Timer Control menu, the boiler selects
the Economy mode. In this condition, the button 7 - fig. 1 on the boiler panel
is disabled.
On enabling DHW from the Remote Timer Control menu, the boiler selects
the Comfort mode. In this condition it is possible select one of the two modes
with the button 7 - fig. 1 on the boiler panel.
Sliding Temperature Both the Remote Timer Control and the boiler card manage Sliding Tempera-
ture adjustment: of the two, the boiler card Sliding Temperature has priority.
20
30
40
50
60
70
80
90
85
20 10 0 -10 -20
1
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20
30
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50
60
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80
90
85
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20 10 0 -10 -20
20
30
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50
60
70
80
90
85
1
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568910 7
OFFSET = 20 OFFSET = 40

DIVAtop F 24
11EN cod. 3540E821 - 11/2008 (Rev. 00)
Water system pressure adjustment
The filling pressure with system cold, read on the boiler water gauge, must be approx. 1.0 bar. If the system pressure
falls to values below minimum, the boiler card will activate fault F37 (fig. 16).
fig. 16 - Low system pressure fault
Operate the filling cock (detail 1 - fig. 17) and bring the system pressure to a value above 1.0 bar.
At the bottom of the boiler there is a pressure gauge (detail 2 - fig. 17) to show the pressure even when there is no power
supply.
fig. 17 - Filling cock
AOnce the system pressure is restored, the boiler will activate the 120-second air venting cycle indicated on the
display by FH.
At the end of the operation always close the filling cock (detail 1 - fig. 17)
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DIVAtop F 24
12 EN
cod. 3540E821 - 11/2008 (Rev. 00)
2. Installation
2.1 General Instructions
BOILER INSTALLATION MUST ONLY BE PERFORMED BY QUALIFIED PERSONNEL, IN ACCORDANCE WITH
ALL THE INSTRUCTIONS GIVEN IN THIS TECHNICAL MANUAL, THE PROVISIONS OF CURRENT LAW, THE PRE-
SCRIPTIONS OF NATIONAL AND LOCAL STANDARDS AND THE RULES OF PROPER WORKMANSHIP.
2.2 Place of installation
The unit's combustion circuit is sealed off from the installation room and therefore the unit can be installed in any kind
of room. However, the installation room must be sufficiently well ventilated to prevent any dangerous conditions from
forming in the event of even slight gas leakage. This safety standard is required by the EEC Directive no. 90/396 for all
gas units, including those with a so-called sealed chamber.
Therefore the place of installation must be free of dust, flammable materials or objects or corrosive gases. The room
must be dry and not subject to freezing.
The boiler is fitted to be installed on a wall and is equipped as standard with a bracket. Secure the bracket to the wall
as described in sec. 4.1 and hook on the boiler. On request, there is a metal template to mark the drilling points on the
wall. The wall fixing must ensure a stable and effective support for the generator.
AIf the unit is enclosed in furniture or mounted alongside, there must be space for removing the casing and for
normal maintenance work
2.3 Plumbing connections
The heating capacity of the unit must be previously established by calculating the building's heat requirement according
to current regulations. The system must be provided with all the components for correct and regular operation. It is ad-
visable to install on-off valves between the boiler and heating system allowing the boiler to be isolated from the system
if necessary.
BThe safety valve outlet must be connected to a funnel or collection pipe, to prevent water spurting onto the
floor in case of overpressure in the heating circuit. Otherwise, if the discharge valve cuts in and floods the
room, the boiler manufacturer cannot be held liable.
Do not use the water system pipes to earth electrical appliances.
Before installation, carefully wash all the pipes of the system to remove residuals or impurities that could affect proper
operation of the unit.
Make the connections to the corresponding connections according to the diagram in sec. 4.1 and the symbols given on
the unit.
The connection kits shown in the figure below (fig. 18) are supplied standard
A - Female sleeve
B - OT 58 nipple
C - O-ring
D - OT 58 clamping ring
E - Copper washer
F - OT 58 fitting
G - Ball cock
fig. 18 - Connection kits
AF
C D E
FEDB CA
G

DIVAtop F 24
13EN cod. 3540E821 - 11/2008 (Rev. 00)
System water charcteristics
In the presence of water harder than 25° Fr (1°F = 10ppm CaCO3), the use of suitably treated water is advisable in order
to avoid possible scaling in the boiler. The treatment must not in any case reduce the hardness to values below 15°F
(Decree 236/88 for uses of water intended for human consumption). Water treatment is indispensable in the case of
very large systems or with frequent replenishing of water in the system. If partial or total emptying of the system be-
comes necessary in these cases, it is advisable to refill it with treated water.
Antifreeze system, antifreeze fluids, additives and inhibitors
The boiler is equipped with an antifreeze system that turns on the boiler in heating mode when the system delivery water
temperature falls under 6°C. The device will not come on if the electricity and/or gas supply to the unit are cut off. If it
becomes necessary, it is permissible to use antifreeze fluid, additives and inhibitors only if the manufacturer of these
fluids or additives guarantees they are suitable for this use and cause no damage to the heat exchanger or other com-
ponents and/or materials of the boiler unit and system. It is prohibited to use generic antifreeze fluid, additives or inhib-
itors that are not expressly suited for use in heating systems and compatible with the materials of the boiler unit and
system.
2.4 Gas connection
BBefore making the connection, ensure that the unit is arranged for operation with the type of fuel available and
carefully clean all the pipes of the gas system to remove any residues that could affect good functioning of the
boiler.
The gas must be connected to the relative connector (see fig. 30) in conformity with current standards, with rigid metal
pipes or with continuous flexible s/steel wall tubing, placing a gas cock between the system and the boiler. Make sure
that all the gas connections are tight. The capacity of the gas meter must be sufficient for the simultaneous use of all
equipment connected to it. The diameter of the gas pipe leaving the boiler does not determine the diameter of the pipe
between the unit and the meter; it must be chosen according to its length and loss of head, in conformity with current
standards.
BDo not use the gas pipes to earth electrical appliances.
2.5 Electrical connections
Connection to the electrical grid
BThe unit's electrical safety is only guaranteed when correctly connected to an efficient earthing system exe-
cuted according to current safety standards. Have the efficiency and suitability of the earthing system checked
by professionally qualified personnel. The manufacturer is not responsible for any damage caused by failure
to earth the system. Also make sure that the electrical system is adequate for the maximum power absorbed
by the unit, as specified on the boiler dataplate.
The boiler is prewired and provided with a Y-cable and plug for connection to the electricity line. The connections to the
grid must be made with a permanent connection and equipped with a bipolar switch whose contacts have a minimum
opening of at least 3 mm, interposing fuses of max. 3A between the boiler and the line. It is important to respect the
polarities (LINE: brown wire / NEUTRAL: blue wire / EARTH: yellow-green wire) in making connections to the electrical
line. During installation or when changing the power cable, the earth wire must be left 2 cm longer than the others.
BThe user must never change the unit's power cable. If the cable gets damaged, switch off the unit and have it
changed solely by professionally qualified personnel. If changing the electric power cable, use solely “HAR
H05 VV-F” 3x0.75 mm2 cable with a maximum outside diameter of 8 mm.
Room thermostat (optional)
BIMPORTANT: THE ROOM THERMOSTAT MUST HAVE VOLTAGE-FREE CONTACTS. CONNECTING 230
V TO THE ROOM THERMOSTAT TERMINALS WILL PERMANENTLY DAMAGE THE ELECTRONIC
BOARD.
When connecting time controls or a timer, do not take the power supply for these devices from their breaking
contacts Their power supply must be by means of direct connection from the mains or with batteries, depend-
ing on the kind of device.

DIVAtop F 24
14 EN
cod. 3540E821 - 11/2008 (Rev. 00)
Accessing the electrical terminal block
After removing the front panel of the boiler (see fig. 28), the terminal block can be accessed for connecting the external
probe (detail 3 fig. 19) of the room thermostat (detail 1 fig. 19) or the remote timer control (detail 2 fig. 19).
fig. 19 - Accessing the terminal block
2.6 Air/fume ducts
Warnings
The unit is “type C” with an airtight chamber and forced draught, the air inlet and fume outlet must be connected to one
of the following extraction/suction systems. The unit is type-approved to work with all the Cxy flue configurations stated
on the technical data plate (some setups are given by way of example in this chapter). It is however possible that some
setups are expressly limited or not permitted by law, standards or local regulations. Before proceeding with installation,
check and meticulously observe the above-mentioned prescriptions. In addition, comply with the provisions concerning
the positioning of wall and/or roof end pieces and the minimum distances from windows, walls, ventilation openings, etc.
BThis C-type unit must be installed using the fume extraction and outlet ducts supplied by the manufacturer in
accordance with UNI-CIG 7129/92. Failure to use them automatically forfeits all warranty and liability of the
manufacturer.
Expansion
AFor fume ducts longer than one metre, in the phase of installation it is necessary to take account of the natural
expansion of the materials during operation.
To prevent buckling leave an expansion gap of approximately 2 -- 4 mm for each metre of ducting.
fig. 20 - Expansion
Modulating fan
The unit has an advanced air / fumes flow control system, with modulating fan and pressure sensor.
With this device the unit automatically adapts its operation to the flue type and length, without requiring adjustments
during installation or the use of baffles in the combustion circuit.
Moreover, in daily operation the unit constantly and automatically regulates the air / fume flow according to the change
in thermal load. In this way, combustion and heat exchange always occur in optimum conditions and the unit's thermal
efficiency remains high throughout its power range.
2 ÷ 4 mm

DIVAtop F 24
15EN cod. 3540E821 - 11/2008 (Rev. 00)
Connection with coaxial pipes
fig. 21 - Examples of connection with coaxial pipes ( = Air / = Fumes)
For coaxial connection, fit the unit with one of the following starting accessories. For the wall hole dimensions refer to
sec. 4.1. Any horizontal sections of the fume exhaust must be kept sloping slightly towards the outside, to prevent pos-
sible condensate from flowing back towards the unit.
fig. 22 - Starting accessories for coaxial ducts
Before proceeding with installation, check that the maximum permissible length is not exceeded, bearing in mind that
every coaxial bend gives rise to the reduction indicated in the table. For example, a Ø 60/100 duct comprising a 90°
bend + 1 horizontal metre has a total equivalent length of 2 metres.
Table. 2 - Max. length coaxial ducts
Coaxial 60/100 Coaxial 80/125
Max. permissible length 5 m 10 m
Reduction factor 90° bend 1 m 0.5 m
Reduction factor 45° bend 0.5 m 0.25 m
C
12
C
12
C
32
C
32
C
32
C 12
010014X0010006X0 010007X0
80
100
60
125
68
118
123.5
45.6
100
60

DIVAtop F 24
16 EN
cod. 3540E821 - 11/2008 (Rev. 00)
Connection with separate pipes
fig. 23 - Examples of connection with separate pipes ( = Air / = Fumes)
For connection of the separate ducts, fit the unit with the following starting accessory:
fig. 24 - Starting accessories for separate ducts
Before proceeding with installation, make sure the maximum permissible length has not been exceeded, by means of
a simple calculation:
1. Establish the layout of the system of split flues, including accessories and outlet terminals.
2. Consult the table 4 and identify the losses in meq (equivalent metres) of every component, according to the instal-
lation position.
3. Check that the sum total of losses is less than or equal to the maximum permissible length in table 3.
Table. 3 - Max. length for separate ducts
Separate ducts
Max. permissible length 60 meq
C 52
C
32
C
52 B 22 C 12
50
80
010011X0
80
32

DIVAtop F 24
17EN cod. 3540E821 - 11/2008 (Rev. 00)
Table. 4 - Accessories
Losses in meq
Air
inlet
Fume exhaust
Vertical Horizontal
Ø 80 PIPE 0.5 m M/F 1KWMA38A 0.5 0.5 1.0
1 m M/F 1KWMA83A 1.0 1.0 2.0
2 m M/F 1KWMA06K 2.0 2.0 4.0
BEND 45° F/F 1KWMA01K 1.2 2.2
45° M/F 1KWMA65A 1.2 2.2
90° F/F 1KWMA02K 2.0 3.0
90° M/F 1KWMA82A 1.5 2.5
90° M/F + Test point 1KWMA70U 1.5 2.5
PIPE SECTION with test point 1KWMA16U 0.2 0.2
for condensate drain 1KWMA55U - 3.0
TEE with condensate drain 1KWMA05K - 7.0
TERMINAL air, wall 1KWMA85A 2.0 -
fumes, wall with antiwind 1KWMA86A - 5.0
FLUE Air/fumes split 80/80 1KWMA84U - 12.0
Fume outlet Ø80 1KWMA83U +
1KWMA86U
- 4.0
Ø 100 REDUCTION from Ø80 to Ø100 1KWMA03U 0.0 0.0
from Ø100 to Ø80 1.5 3.0
PIPE 1 m M/F 1KWMA08K 0.4 0.4 0.8
BEND 45° M/F 1KWMA03K 0.6 1.0
90° M/F 1KWMA04K 0.8 1.3
TERMINAL air, wall 1KWMA14K 1.5 -
fumes, wall antiwind 1KWMA29K - 3.0

DIVAtop F 24
18 EN
cod. 3540E821 - 11/2008 (Rev. 00)
Connection to collective flues
fig. 25 - Examples of connection to flues ( = Air / = Fumes)
If you are then going to connect the DIVAtop F 24 boiler to a collective flue or a single flue with natural draught, the flue
must be expressly designed by professionally qualified technical personnel in conformity with the current standards and
be suitable for airtight chamber units equipped with a fan.
In particular, flues must have the following characteristics:
• Be sized according to the method of calculation stated in the current standards.
• Be airtight to the products of combustion, resistant to the fumes and heat and waterproof for the condensate.
• Have a circular or quadrangular cross-section, with a vertical progression and with no constrictions.
• Have the ducts conveying the hot fumes adequately distanced or isolated from combustible materials.
• Be connected to just one unit per floor.
• Be connected to just one type of unit (or all and only forced draught units or all and only natural draught units).
• Have no mechanical suction devices in the main ducts.
• Be at a lower pressure, all along their length, under conditions of stationary operation.
• Have at their base a collection chamber for solid materials or condensation equipped with a metal door with an air-
tight closure.
C82 C42
C42

DIVAtop F 24
19EN cod. 3540E821 - 11/2008 (Rev. 00)
3. Service and maintenance
All adjustment, conversion, system start-up and maintenance operations described hereunder must be carried out solely
by Qualified Personnel (with the professional technical requirements prescribed by current regulations) such as the person-
nel of the Local After-Sales Technical Service.
FERROLI declines any responsibility for damage or physical injury caused by unqualified and unauthorized persons tam-
pering with the device.
3.1 Adjustments
Gas supply conversion
The unit can function with either Natural Gas or LPG and is factory-set for use with one of the two gases, as clearly
shown on the packing and on the unit's dataplate. Whenever a different gas to that for which the unit is preset has to be
used, a conversion kit will be required, proceeding as follows:
1. Replace the nozzles at the main burner, inserting the nozzles specified in the technical data table of sec. 4.4, ac-
cording to the type of gas used
2. Edit the parameter for the type of gas:
• turn the boiler onto standby
• press the RESET button (part 8 - fig. 1) for 10 seconds: the display will show “TS“ blinking
• press the RESET button (part 8 - fig. 1): the display will show “P01“.
• Press the tap water buttons (part 1 and 2 - fig. 1) to set parameter 00 (for natural gas operation) or
01 (for LPG operation).
• Press the RESET button (part 8 - fig. 1) for 10 seconds.
• the boiler will go back onto standby
3. Adjust the burner minimum and maximum pressures (ref. relevant paragraph), setting the values given in the tech-
nical data chart for the type of gas used
4. Apply the sticker contained in the conversion kit, near the dataplate as proof of the conversion.
Turning on TEST mode
Press the heating buttons (part 3 and 4 - fig. 1) simultaneously for 5 seconds to turn on TEST mode. The
boiler will ignite at the maximum heating power set as described in the following paragraph.
On the display, the heating (part 24 - fig. 1) and tap water (part 12 - fig. 1) symbols will blink; alongside, it will show the
heating power and the ignition power respectively.
fig. 26 - TEST mode (heating power = 100%)
To turn off TEST mode, repeat the sequence for turning it on.
TEST mode anyhow turns off automatically after 15 minutes.
e
c
o
c
o
m
f
o
r
t
m
o
d
e
r
e
s
e
t
eco
bar

DIVAtop F 24
20 EN
cod. 3540E821 - 11/2008 (Rev. 00)
Adjustment of pressure at burner
Since this unit has flame modulation, there are two fixed pressure values: minimum and maximum, which must be those
given in the technical data table according to the type of gas.
• Connect a suitable pressure gauge to the pressure point "B" downstream of the gas valve.
• Disconnect the pressure compensation tube “N”.
• Remove the protection cap “D”.
• Operate the boiler in TESTfig. 1 mode.
• Adjust the maximum pressure setting by turning the screw “G” clockwise to increase the pressure and anticlock-
wise to decrease it.
• Disconnect one of the two fastons "C" from modureg "F" on the gas valve.
• Adjust the minimum pressure setting by turning the screw "E" clockwise to increase the pressure and anticlockwise
to decrease it.
• Turn the burner on and off, checking that the minimum pressure value remains stable.
• Reconnect the faston "C" detached from modureg "F" on the gas valve
• Check that the maximum pressure has not changed
• Reconnect the pressure compensation tube “N”.
• Refit the protection cap “D”.
• To end the TEST mode, repeat the activation sequence or wait 15 minutes.
AAfter checking or adjusting the pressure, seal the adjustment screw with paint or a suitable seal.
fig. 27 - Gas valve
APressure point upstream
BPressure point downstream
CModureg electrical connection
DProtection cap
EMinimum pressure adjustment
FModureg
GMinimum pressure adjustment
HCompensation tube connection
IGas valve electrical connection
LSealed chamber
MPressure gauge
NCompensation tube
RGas outlet
SGas inlet
FH I
B A
R
+
B
D
E
C
F
M
N
L
S